///*
// * Copyright 2002-2021 the original author or authors.
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// * you may not use this file except in compliance with the License.
// * You may obtain a copy of the License at
// *
// *      https://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//
//package org.springframework.core.metrics.jfr;
//
//import java.util.Deque;
//import java.util.concurrent.ConcurrentLinkedDeque;
//import java.util.concurrent.atomic.AtomicLong;
//
//import org.springframework.core.metrics.ApplicationStartup;
//import org.springframework.core.metrics.StartupStep;
//
///**
// * {@link ApplicationStartup} implementation for the Java Flight Recorder.
// * <p>This variant records {@link StartupStep} as Flight Recorder events. Because
// * such events only support base types, the
// * {@link org.springframework.core.metrics.StartupStep.Tags} are serialized as a
// * single String attribute.
// * <p>Once this is configured on the application context, you can record data by
// * launching the application with recording enabled:
// * {@code java -XX:StartFlightRecording:filename=recording.jfr,duration=10s -jar app.jar}.
// *
// * @author Brian Clozel
// * @since 5.3
// */
//public class FlightRecorderApplicationStartup implements ApplicationStartup {
//
//	private final AtomicLong currentSequenceId = new AtomicLong(0);
//
//	private final Deque<Long> currentSteps;
//
//
//	public FlightRecorderApplicationStartup() {
//		this.currentSteps = new ConcurrentLinkedDeque<>();
//		this.currentSteps.offerFirst(this.currentSequenceId.get());
//	}
//
//
//	@Override
//	public StartupStep start(String name) {
//		long sequenceId = this.currentSequenceId.incrementAndGet();
//		this.currentSteps.offerFirst(sequenceId);
//		return new FlightRecorderStartupStep(sequenceId, name,
//				this.currentSteps.getFirst(), committedStep -> this.currentSteps.removeFirstOccurrence(sequenceId));
//	}
//
//}
